package solution.s_387;

public class Solution20190807 {
    public int firstUniqChar(String s) {
        int[] freq = new int[26];

        for (int i = 0; i < s.length(); i ++) {
            freq[s.charAt(i) - 'a'] ++;
        }

        for (int i = 0; i < s.length(); i ++) {
            if (freq[s.charAt(i) - 'a'] == 1) {
                return i;
            }
        }

        return -1;
    }
}
